Analog Electronics
A working diode must have

 High resistance when forward or reverse biased
 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward biased, while high resistance when reverse bias
 Low resistance when forward or reverse biased

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Analog Electronics
For an NPN transistor in normal bias

  only majority carriers cross the collector junction.
  Je is forward biased and Jc is reverse biased.
  only holes cross the collector junction.
  the emitter junction has high resistance.

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